/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */
package org.hisp.dhis.webapi.security.vote;

import java.util.Collection;
import lombok.extern.slf4j.Slf4j;
import org.springframework.security.access.AccessDecisionVoter;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;

/**
 * Simple AccessDecisionVoter which grants access if a specified required authority is among the
 * configAttributes.
 *
 * @author Torgeir Lorange Ostby
 * @version $Id: SimpleAccessVoter.java 6352 2008-11-20 15:49:52Z larshelg $
 */
@Slf4j
public class SimpleAccessVoter implements AccessDecisionVoter<Object> {
  private String requiredAuthority;

  public void setRequiredAuthority(String requiredAuthority) {
    this.requiredAuthority = requiredAuthority;
  }

  // -------------------------------------------------------------------------
  // Interface implementation
  // -------------------------------------------------------------------------

  public SimpleAccessVoter(String requiredAuthority) {
    this.requiredAuthority = requiredAuthority;
  }

  @Override
  public boolean supports(ConfigAttribute configAttribute) {
    return configAttribute != null
        && configAttribute.getAttribute() != null
        && configAttribute.getAttribute().equals(requiredAuthority);
  }

  @Override
  public boolean supports(Class<?> clazz) {
    return true;
  }

  @Override
  public int vote(
      Authentication authentication, Object object, Collection<ConfigAttribute> attributes) {
    for (GrantedAuthority authority : authentication.getAuthorities()) {
      if (authority.getAuthority().equals(requiredAuthority)) {
        log.debug("ACCESS GRANTED [" + object.toString() + "]");

        return ACCESS_GRANTED;
      }
    }

    log.debug("ACCESS DENIED [" + object.toString() + "]");

    return ACCESS_DENIED;
  }
}
